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On the application of additive manufacturing methods for auxetic structures: a review

Advances in Manufacturing 2021年第3期9卷 342-368页

作者： Athul Joseph Vinyas Mahesh dineshkumar harursampath Nonlinear Multifunctional Composites Analysis and Design(NMCAD)Laboratory Department of Aerospace EngineeringIndian Institute of ScienceBangalore560012India Department of Mechanical Engineering National Institute of TechnologySilcharAssam788010India

Auxetic structures are a special class of structural components that exhibit a negative Poisson’s ratio(NPR)because of their constituent materials,internal microstructure,or structural *** realize such structures,specialized manufacturing processes are required to achieve a dimensional accuracy,reduction of material wastage,and a quicker ***,additive manufacturing(AM)techniques play a pivotal role in this *** is a layer-wise manufacturing process and builds the structure as per the designed geometry with appreciable precision and ***,it is extremely beneficial to fabricate auxetic structures using AM,which is otherwise a tedious and expensive *** this study,a detailed discussion of the various AM techniques used in the fabrication of auxetic structures is *** advancements and advantages put forward by the AM domain have offered a plethora of opportunities for the fabrication and development of unconventional ***,the authors have attempted to provide a meaningful encapsulation and a detailed discussion of the most recent of such advancements pertaining to auxetic *** article opens with a brief history of the growth of auxetic materials and later auxetic ***,discussions centering on the different AM techniques employed for the realization of auxetic structures are *** basic principle,advantages,and disadvantages of these processes are discussed to provide an in-depth understanding of the current level of ***,the performance of some of the prominent auxetic structures realized through these methods is discussed to compare their benefits and *** addition,the influences of geometric and process parameters on such structures are evaluated through a comprehensive review to assess their feasibility for the later-mentioned ***,valuable insights into the applications,limitations,and prospects of AM for auxetic structures

关键词： Auxetic Additive manufacturing(AM) Negative Poisson’s ratio(NPR) Mechanical performance Unit-cell structure

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An experimental study on ballistic impact response of jute reinforced polyethylene glycol and nano silica based shear thickening fluid composite

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Defence Technology（防务技术） 2022年第3期18卷 401-409页

作者： Vishwas Mahesh dineshkumar harursampath Vinyas Mahesh NMCAD Lab Department of Aerospace EngineeringIndian Institute of Science(IISc)Bangalore560012KarnatakaIndia Department of Industrial Engineering and Management Siddaganga Institute of Technology KarnatakaTumakuru572102India Department of Mechanical Engineering National Institute of Technology SilcharAssam788010India

The present study aims at assessing the ballistic impact behaviour of jute reinforced polyethylene glycol(PEG)and nano silica based shear thickening fluid(STF).Preparation of STF is achieved by dispersing the nano silica particles at different weight percentage loadings of 10%,20%,30%and 40%in PEG and the effect of various weight percentages loading of nano silica particles on ballistic performance of the proposed composites is studied *** studies of the prepared STF’s showed that at all nanosilica loading shear thickening occurred and also the shear thickening was highest at higher loading of nano silica at lower rate of *** study reveals that the ballistic performance of the jute fabric is enhanced with impregnation of *** ballistic results indicate that energy absorption of the proposed composites is enhanced with increased loading of nano silica particles and at the same time,the effect of STF was *** energy absorption(SEA)of the neat fabric and the proposed composites was made use of for the purpose of comparing the energy absorption *** is found that the SEA of proposed composites with 10%nano silica loading is lesser than the neat fabric both in case of 3 layers and 6 *** was also found that proposed composite with 40%nano silica loading exhibits highest SEA compared to neat fabric and its counterparts with its SEA being 3.21 and 3.76 times highest compared to three and six layers of neat fabrics respectively.

关键词： Ballistic impact Shear thickening fluid Nano silica Jute

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Correlation of cardiac troponin T levels with inotrope requirement,hypoxic-ischemic encephalopathy,and survival in asphyxiated neonates

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World Journal of Clinical Pediatrics 2022年第1期11卷 85-92页

作者： Ramesh Bhat Yellanthoor dineshkumar Rajamanickam Head of Unit 1 Department of PediatricsKasturba Medical CollegeManipal Academy of Higher Education(MAHE)UniversityManipal 576104KarnatakaIndia Department of Paediatrics Kasturba Medical CollegeManipal Academy of Higher Education(MAHE)UniversityManipal 576104KarnatakaIndia

BACKGROUND Cardiac involvement in neonates with perinatal asphyxia not only complicates perinatal management but also contributes to increased *** To assess cardiac troponin T(cTnT)levels in asphyxiated neonates and their correlation with echocardiography findings,inotrope requirement,hypoxicischemic encephalopathy(HIE)stages,and *** cTnT levels,echocardiographic findings,the requirement of inotropes,HIE stages,and outcome were studied in neonates of gestational age≥34 wk with perinatal *** Among 57 neonates with perinatal asphyxia,male gender,cesarean section,forceps/vacuum-assisted vaginal delivery and late preterm included 33(57.9%),23(40.4%),3(5.3%),and 12(21.1%)*** mean gestational age was 38.4 wk(1.6 wk).HIE stages I,II,and III were observed in 7(12.3%),37(64.9%),and 9(15.8%)neonates respectively.26(45.6%)neonates had echocardiographic changes and 19(33.3%)required *** levels were elevated in 41(71.9%)neonates[median(IQR);0.285(0.211-0.422)ng/mL].The Median cTnT level showed an increasing trend with increasing changes in echocardiography(P=0.002).Two neonates with mitral regurgitation and global hypokinesia had the highest cTnT levels(1.99 and 0.651 ng/mL).Of 31 neonates with normal echocardiography,18(58.06%)showed elevated *** levels were significantly higher in those who required inotropic support than those who did not(P=0.007).Neonates with HIE stage III had significantly higher cTnT levels compared to those with HIE stage I/II(P=0.013).Survivors had lower median cTnT levels[0.210(0.122-0.316)ng/mL]than who succumbed[0.597(0.356-1.146)ng/mL].CONCLUSION cTnT levels suggestive of cardiac involvement were observed in 71.9%of asphyxiated *** levels correlated with echocardiography findings,inotrope requirement,HIE stages,and mortality.

关键词： Asphyxia Cardiac dysfunction Inotropes Neonates troponin T Survival

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Facial Expression Recognition Using Enhanced Convolution Neural Network with Attention Mechanism

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Computer Systems Science & Engineering 2022年第4期41卷 415-426页

作者： K.Prabhu S.SathishKumar M.Sivachitra S.dineshkumar P.Sathiyabama Department of EIE Kongu Engineering CollegePerundurai638060TamilnaduIndia Department of EEE M.Kumarasamy College of EngineeringKarur639113TamilnaduIndia Department of EEE Kongu Engineering CollegePerundurai638060TamilnaduIndia Department of EEE CSI Engineering CollegeKetti643215TamilnaduIndia

Facial Expression Recognition(FER)has been an interesting area of research in places where there is human-computer *** psychol-ogy,emotions and behaviors can be analyzed in ***ﬁers used in FER have been perfect on normal faces but have been found to be constrained in occluded ***,Deep Learning Techniques(DLT)have gained popular-ity in applications of real-world problems including recognition of human *** human face reﬂects emotional states and human *** expression is the most natural and powerful way of communicating *** which form communications between the two are termed Human Machine Interaction(HMI)*** can improve HMI systems as human expressions convey useful information to an *** paper proposes a FER scheme called EECNN(Enhanced Convolution Neural Network with Atten-tion mechanism)to recognize seven types of human emotions with satisfying results in its *** EECNN achieved 89.8%accuracy in classi-fying the images.

关键词： Facial expression recognition linear discriminant analysis animal migration optimization regions of interest enhanced convolution neural network with attention mechanism

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Phytochemical and antimicrobial activity of green microalgae from Vellar Estuary,southeast coast of India

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Journal of Coastal Life Medicine 2016年第5期4卷 374-376页

作者： dineshkumar Ramar Narendran Rajendran Sampathkumar Pichai Centre of Advanced Study in Marine Biology Faculty of Marine SciencesAnnamalai University608502 ParangipettaiIndia

Objective:To determine the phytochemicals and screen the antimicrobial potential of Desmococcus olivaceus(***)and Chlorella vulgaris(***)against human bacterial ***:*** and *** were collected and confirmed through morphological *** were analyzed and confirmed by chemical *** layer chromatography was performed to evaluate the bioactive compounds present in the solvent *** activity of the extract obtained from dried green microalgae was tested against Gram negative and Gram positive bacteria using agar disc diffusion *** Gram negative bacteria like Klebsiella pneumonia,Proteus mirabilis,Vibrio cholerae,Salmonella typhi,Escherichia coli and Gram positive bacteria including Staphylococcus aureus,Bacillus subtilis,Enterococcus sp.,Clostridium botulinum(***)and Nocardia *** selected for *** cultures were obtained from Microbial Culture Maintenances Laboratory,Department of Medical Microbiology,Rajah Muthaiah Medical College,Annamalai University,Tamil Nadu,***:Seven bioactive compounds were detected viz.,phenols,tannin,flavanoids,saponins,terpenes,carbohydrates,alkaloids and *** Gram negative bacteria,Proteus mirabilis treated with ethanol extract of *** showed the maximum inhibition zone(17.2 mm),whereas in Gram positive bacteria,*** treated with diethyl ether extract showed inhibition zone of 19.0 *** test for ***,Gram negative bacteria Salmonella typhi treated with ethanol extract showed the maximum inhibition zone(13.0 mm),whereas in Gram positive bacteria,*** treated with chloroform extract of *** showed the maximum inhibition zone of 15 ***:The results clearly indicated that *** and *** contain promising antibacterial compounds.

关键词： Desmococcus olivaceous Chlorella vulgaris Phytochemical Alkaloids and steroids Antibacterial activity

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芸苔近群种：叶斑病遗传抗性的一个丰富库

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国外作物育种 2003年第2期22卷 42-43页

作者： GirishSharma V.dineshkumar 谢国禄

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